The app doesn’t start on iPhone 5C

This developer is terrible… This problem has bobbed up in one of the previous updates and I was waiting for an update that would let me finally launch the app (for some reason the widget still works for water intake input!!!) and transfer my data to a different app and delete this WaterMinder… But when the update came out and solved the launch issue I was too naive to think that it would not come back. Please rectify this issue, so that I can stop using your terrible software once and for all!

P-L-A-Y-E-R about Water Tracker by WaterMinder®